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FVTX Software and Simulation

FVTX Software and Simulation. Zhengyun You Los Alamos National Laboratory. Outline. Software updates Simulation Geometry Hit response & reconstruction Tracking Ongoing and future work Software organization. Event Generation (PYTHIA, HIJING). Full GEANT3 simulation. Real Data (PRDF).

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FVTX Software and Simulation

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  1. FVTX Software and Simulation Zhengyun You Los Alamos National Laboratory Zhengyun YOU, FVTX Review Nov 2008

  2. Outline • Software updates • Simulation • Geometry • Hit response & reconstruction • Tracking • Ongoing and future work • Software organization Zhengyun YOU, FVTX Review Nov 2008

  3. Event Generation (PYTHIA, HIJING) Full GEANT3 simulation Real Data (PRDF) Digitize hits into Hit Silicon Strips Clusters formed and Centroids Extracted Find FVTX Tracks Find Muon Tracks Match MuTr and FVTX Tracks Kalman Filter Fit Extract DCA, other Fit Variables, Analysis Software Overview • Current status: • All materials have been updated to current design in simulation • Full geometry updated in simulation and offline code • New hit response and cluster fitting • Track reconstruction algorithm updated • To be developed : • Phenix Raw Data File (PRDF) generation • Alignment and Calibration software • Online Monitoring • Database Interface Zhengyun YOU, FVTX Review Nov 2008

  4. Simulation Radiation length Materials fully described in GEANT3 Radiation length on one Station (North St2) FVTX overall Station Wedge Wedge projection view Radiation length of one Wedge (North St2, Wedge 1) Zhengyun YOU, FVTX Review Nov 2008

  5. Offline geometry is fully converted from detector description in GEANT3 to ROOT for consistency, with alignment correction allowed Two versions of design allowed for performance comparison Strips added for full description FVTX Station Wedge Strips Geometry in Offline Old design New design(displayed in ROOT) Zhengyun YOU, FVTX Review Nov 2008

  6. Count 600 500 Q (charge) distribution on strips 400 300 200 100 0 10000 20000 30000 40000 50000 Q (charge) ADC Weighted, using true Q ADC vs. Q (charge) 3 bit (8 bin) conversion Weighted, using ADC Unweighted 10000 20000 30000 40000 50000 Q (charge) threshold ADC conversion 5 10 15 20 25 30 35 40 45 50 Coordinate Resolution (m) Hit response & reconstruction • ADC conversion (3 bit) • Noise level added • Noises added to charge • Random noise hits added • Cluster finding & Fitting Zhengyun YOU, FVTX Review Nov 2008

  7. Tracking • New track finding algorithm (Columbia) • In Au+Au events (highest occupancy environment, but reasonably modest, 3% occupancy) • Good FVTX track finding efficiency • Good efficiency for matching Muon (MUID+MUTR) tracks and FVTX tracks • Expect further tuning to improve performance even further FVTX Track Finding Efficiency (In Au+Au events) MUTR-FVTX Track Matching Efficiency (Prompt muons in Au+Au events) Zhengyun YOU, FVTX Review Nov 2008

  8. prompt pm DCA_r (with updated geometry and software ) DCA_r (old design and simulation in review 2007) DCA_r Resolution (cm) DCA_r Resolution (cm) Momentum (GeV/c) Momentum (GeV/c) DCA (Distance of Closest Approach) • Use Kalman Filter to fit and project to z_vertex • Get DCA components in r (good) and phi (less good) • ~100 m resolution in DCA_r • Multiple-scattering dominated resolution • Sufficient resolution to separate prompt, heavy quark, and light meson decays Zhengyun YOU, FVTX Review Nov 2008

  9. Blind analysis Event Generation GEANT Simulation (all sub-detectors in central & muon arms ) Hit response Blind to MC DST (with MC info) DST (without MC info) Reconstruction with MC Reconstruction Physics Result with MC Physics Result Result comparison • The purpose of blind analysis is to test the • performance of VTX/FVTX software, and to • show that they are ready for real data analysis • Events are generated and simulated with • VTX + FVTX + other PHENIX sub-detectors • Analyzers only get DST files and are blind to MC • information. Analysis results will be compared • with MC information. If possible problems exist, • they will be found and be fixed until two sides • match. Zhengyun YOU, FVTX Review Nov 2008

  10. Loop Roadmap 5/08 11/08 4/09 Geometry revalidation Check Cluster&Track finding Test events generation Test events analysis Large scale events generation MC Info Events analysis Result comparison Blind analysis Fix possible problems Alignment tool Database Online Monitoring Zhengyun YOU, FVTX Review Nov 2008

  11. Manpower in Blind Analysis Zhengyun YOU, FVTX Review Nov 2008

  12. Future Work & Manpower Software Leader H. v Hecke (LANL) X. Wang (NMSU) GEANT Simu. H.v Hecke (LANL) D. M. Lee (LANL) Offline Software M. Brooks (LANL) Z. You (LANL) X. Wang (NMSU) D. Winter (Columbia) E. Vazquez (Columbia) H.Pereira (Saclay) Analysis LANL, NMSU, Columbia, UNM, Saclay, BNL, … Alignment Z. You (LANL) NMSU Database Columbia Online Monitoring LANL Columbia • Blind analysis • Alignment tool • Online monitoring • Database interface Zhengyun YOU, FVTX Review Nov 2008

  13. Summary • Much progress in software updates in this year • All materials described in GEANT3 • Full geometry updated in offline code • New hits response and cluster finding • New track finding algorithm • Blind analysis and other work is going well Zhengyun YOU, FVTX Review Nov 2008

  14. Backup Slides Zhengyun YOU, FVTX Review Nov 2008

  15. DCA(r) in embedded events same With staggering DCA r-z resolution (cm) DCA -z resolution (cm) Muon acceptance With staggering Momentum (GeV) Momentum (GeV) FVTX Performance – DCA (In Review 2007) DCA_r DCA_phi (r) Without staggering Zhengyun YOU, FVTX Review Nov 2008

  16. Physics analysis • Single Muons • Precise heavy flavor and hadron measurements at forward rapidity • Separation of charm and beauty • W background rejection improved • Dimuons • First direct bottom measurement via BJ/ • Separation of J/ from ’ with improved in resolution and S:B • First Drell-Yan measurements from RHIC • Direct measurement of c-cbar events via +- becomes possible • Physics • Advance understanding of energy loss, by adding precise heavy flavor measurements of RAA and flow. • First detection of ’ plus heavy quark allow detailed understanding of vector meson production and modification • Separation/Understanding of Cold Nuclear Matter and QGP effects with rapidity coverage • Precise gluon polarization and sea quark measurements over large x range, fundamental tests of Sivers functions possible Zhengyun YOU, FVTX Review Nov 2008

  17. Heavy flavor measurement Full simulation and reconstruction with FVTX Signal & Background extracted from PHENIX run2 measurements S/B enhancement for D ->  S/B enhancement for B ->  Zhengyun YOU, FVTX Review Nov 2008

  18. Background reduced by ~105 Most of signals kept Simulated W signaland background from Run5 Background before cuts background W->  before/after cuts W->  Background after cuts W background rejection • Single muon spectrum contributions from: • W-->X • Hadron punch-throughs & decays • Mis-reconstructed hadrons • Tight MuTr cuts plus FVTX cuts improve signal:background by ~105 Zhengyun YOU, FVTX Review Nov 2008

  19. Dimuon spectra improvement • Mass Resolution and Background Rejection Improvement • ’ added to vector meson measurements, J/ improved for given run, precision open • heavy flavor added (recombination) • QGP and CNM vector meson production understood p+p Au+Au Zhengyun YOU, FVTX Review Nov 2008

  20. Heavy Ion RAA with FVTX • Mechanisms for heavy/light quark suppression poorly understood • Clear distinction among models • Radiative energy loss (W.Horowitz & S.Wicks et al.) • Radiative and collisional energy loss (M. Djordjevic et al.) • Dissociative energyloss (I. Vitev et al.) FVTX provides discrimination power even without c/b separation Zhengyun YOU, FVTX Review Nov 2008

  21. Heavy Ion RAA for charm/beauty Separated Statistical separation of charm and beauty with DCA cuts Zhengyun YOU, FVTX Review Nov 2008

  22. Double Spin Asymmetry ALL from pp Measurements of open charm and beauty add decisive information to the quest determining the source of the nucleon spin! Zhengyun YOU, FVTX Review Nov 2008

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